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Before Patrick Mahomes laced up his cleats for his 2026-2027 NFL regular-season debut, US prediction markets had already cleared a historic benchmark for the opening week of the season.

Two operators alone – Kalshi and Polymarket – topped the combined $1 billion mark in NFL trading activity over the first six days of Week 1, according to numerous measures this week. During the period, Kalshi recorded NFL volume of $983.4 million, according to DeFi Rate, earning the pole position by a large margin. Mahomes and the Kansas City Chiefs thrashed the Denver Broncos 31-10 on Monday Night Football, capping the largest week for prediction markets ever.

Even before the primetime matchup in Kansas City, it became abundantly clear that the industry would shatter previous marks for weekly activity. The AFC West showdown bolstered the already robust totals. Overall, volume for the week hit a record $15.9 billion, according to Bank of America, up 16% from a week earlier.

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Entain has issued a stark warning in a letter addressed to Prime Minister Andy Burnham about the potential impact of a proposed increase to the Machine Games Duty (MGD). 

Ahead of the government’s Autumn Budget in October, Entain CEO Stella David cautioned that doubling the current MGD rate to 40% could result in widespread closures of betting shops and significant job losses, while potentially reducing tax revenues for the government.

A potential MGD rise was first reported in the The Financial Times, as Chancellor John Healey is allegedly looking to raise the tax, on the recommendation of the Social Market Foundation, which proposed the increase in a recent report.

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Prior to announcing the Yahoo Finance accord last November, Polymarket and one of its rivals unveiled deals with Google Finance.

In January, Polymarket and Dow Jones announced an agreement that paved the way for event contract data to appear on various Dow Jones sites, including The Wall Street Journal. Dow Jones also owns Barron’s, Investor’s Business Daily and MarketWatch, among other media properties.

Polymarket also has marketing deals with Major League Baseball (MLB), Major League Soccer (MLS), the NHL and UFC.